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D( x )
3*x+5 = 0
25-(9*x^2) = 0
3*x+5 = 0
3*x+5 = 0
3*x+5 = 0 // - 5
3*x = -5 // : 3
x = -5/3
25-(9*x^2) = 0
25-(9*x^2) = 0
25-9*x^2 = 0
-9*x^2 = -25 // : -9
x^2 = 25/9
x^2 = 25/9 // ^ 1/2
abs(x) = 5/3
x = 5/3 or x = -5/3
x in (-oo:-5/3) U (-5/3:5/3) U (5/3:+oo)
9/(3*x+5) = (45-(27*x))/(25-(9*x^2)) // - (45-(27*x))/(25-(9*x^2))
9/(3*x+5)-((45-(27*x))/(25-(9*x^2))) = 0
9/(3*x+5)-((45-27*x)/(25-9*x^2)) = 0
9/(3*x+5)+(-1*(45-27*x))/(25-9*x^2) = 0
(9*(25-9*x^2))/((3*x+5)*(25-9*x^2))+(-1*(45-27*x)*(3*x+5))/((3*x+5)*(25-9*x^2)) = 0
9*(25-9*x^2)-1*(45-27*x)*(3*x+5) = 0
0 = 0
0/((3*x+5)*(25-9*x^2)) = 0
0/((3*x+5)*(25-9*x^2)) = 0 // * (3*x+5)*(25-9*x^2)
0 = 0
x belongs to the empty set
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